1st time incubator -- fine tuning

I just finished my home made incubator and am waiting for my fertile eggs to arrive. I've done hours of searching and reading on the site and have learned a ton, but now i'm looking for a few bits of specific advice. I just know there are some incubation geniuses out there looking to share their knowledge.

1. The bator has been cycling for about 12 hours and the egg-o-meter is fluctuating between 99.3 and 100.0 Is that close enough tolerance?? My thought is that nature is less precise than that, so it should be OK, but I want to be sure.....there are little lives at stake her after all! The ambient temp inside the incubator fluctuates a bit more. About 98-102. But so far no spikes in either direction.

2. Is 2x40watts too much? would a more gentle 2x25 watt be better?

I know this is my first attempt with incubation and I will learn from any mistakes, but I also want to limit those mistakes. So any and all tips and advice is very welcome and appreciated.

*I read a few posts that said that wafer thermostats are more precise than the water heater ones, but alas, I had already begun construction.

Rebel yell, I did read something about that. Have you found it to make a big difference? I could do it, but it would require moving a few things around, and of course, another re-calibration. But I do have the time as my eggs a re still a few days away.

Its up to you, I made mine out of a Omaha Steaks ice chest & hung it about 3 inches away from it & it varied almost 7 deg. I moved it to about 1 inch or so & got a 1-2 deg. out of it, it varies less than my wafer thermostat does in my mini fridge bator, if I had time i would do it, but that's just me.

Thanks for the tip, if I have space to mount it on a bracket and still have access to the adjustment screw I will try it. Right now it is mounted to the wall with the side facing the light bulbs. It is spaced out from the wall about 1.5 inches which helps, but by that same logic, your suggestion would be even better.....back to the workbench I go!!!!!!